Merge pull request monero-project#160 from stoffu/aeon-iDunk5400-win-…

…mingw-gcc9

Windows: MSYS2 build fix and hardening changes /monero#6020

CMakeLists.txt

@@ -635,17 +635,19 @@ else()
   add_cxx_flag_if_supported(-Wformat-security CXX_SECURITY_FLAGS)
 
   # -fstack-protector
-  if (NOT WIN32)
+  if (NOT (WIN32 AND (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_LESS 9.1)))
     add_c_flag_if_supported(-fstack-protector C_SECURITY_FLAGS)
     add_cxx_flag_if_supported(-fstack-protector CXX_SECURITY_FLAGS)
     add_c_flag_if_supported(-fstack-protector-strong C_SECURITY_FLAGS)
     add_cxx_flag_if_supported(-fstack-protector-strong CXX_SECURITY_FLAGS)
   endif()
 
   # New in GCC 8.2
-  if (NOT WIN32)
+  if (NOT (WIN32 AND (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_LESS 9.1)))
     add_c_flag_if_supported(-fcf-protection=full C_SECURITY_FLAGS)
     add_cxx_flag_if_supported(-fcf-protection=full CXX_SECURITY_FLAGS)
+  endif()
+  if (NOT WIN32 AND NOT OPENBSD)
     add_c_flag_if_supported(-fstack-clash-protection C_SECURITY_FLAGS)
     add_cxx_flag_if_supported(-fstack-clash-protection CXX_SECURITY_FLAGS)
   endif()
@@ -657,8 +659,8 @@ else()
   endif()
 
   # linker
-  if (NOT WIN32)
-    # Windows binaries die on startup with PIE
+  if (NOT (WIN32 AND (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_LESS 9.1)))
+    # Windows binaries die on startup with PIE when compiled with GCC <9.x
     add_linker_flag_if_supported(-pie LD_SECURITY_FLAGS)
   endif()
   add_linker_flag_if_supported(-Wl,-z,relro LD_SECURITY_FLAGS)
@@ -678,6 +680,7 @@ else()
   if (WIN32)
     add_linker_flag_if_supported(-Wl,--dynamicbase LD_SECURITY_FLAGS)
     add_linker_flag_if_supported(-Wl,--nxcompat LD_SECURITY_FLAGS)
+    add_linker_flag_if_supported(-Wl,--high-entropy-va LD_SECURITY_FLAGS)
   endif()
 
   message(STATUS "Using C security hardening flags: ${C_SECURITY_FLAGS}")